from: botrnfai4 · millstone 2 - march 2003 reactor trip sequence of events timeline -rev. 0 time...

t Steven Unikewicz-Rev. 0, EventReviewTeam Timeline -March2003MP-2 Reaco Trip Pg

From: <Alex_J_House~dom.com> botrnfai4.fTo: <[email protected]>, <[email protected]>, <[email protected]>,<Denny_Hicks @dom:com>, <Clark_D_Maxson @dom.com>, <BillJ_Hoffner@ dom.com>,<StephenrJ_Baker@ dom.com>, <MichaeL__Baughman @ dom.com>,<[email protected]>, <Patti_A_Luckey dom.com>, <[email protected]>,<RichardA_Perry dom.com>, <[email protected]>, <James_R_PelchatEdom.com>,<Richard_W_Mcintosh @dom.com>, <DianeFredericks @ dom.com>Date: 3/17/03 10:18AMSubject: Rev. 0, Event Review Team Timeline - March 2003 MP-2 Reactor Trip

Please review the forwarded Unit 2 March 7,2003 Reactor Trip eventtimeline, RevO, which has been prepared by Robert Borchert with input fromvarious sources. Additionally, the charging specific issues were reviewedby Tom Ripple.

Please be aware that this timeline is intended to be expanded in contentbased upon additional discoveries, your feedback, and plannedverification/validation of specific timeline items.

Alex HouseDominion Nuclear Connecticut, Inc.Millstone Root Cause Program Coordinator(860)447-1791 x0827

Forwarded by Alex J House/MILLSTONE/VANCPOWER on 03/17/2003 10:01 AM

Robert A BorchertTo: Alex J House/MILLSTONE/VANCPOWER@VANCPOWER,

03/17/2003 10:00 Stephen E Scace/MILLSTONENANCPOWER6@VANCPOWER,Jeffry

AM A Langan/MILLSTONE/VANCPOWER@VANCPOWER, Skip JJordan/MILLSTONE/VANCPOWER@VANCPOWER, Pierre FL'Heureux/MILLSTONE/VANCPOWER@VANCPOWER, Clark DMaxson/MILLSTONE/\ANCPOWER @VANCPOWER

cc:Subject: Rev. 0, Event Review Team Timeline - March2003 MP-2 Reactor Trip

Alex,

Attached please find Rev. 0 of the Event Review Team Timeline for the MP-2March 7, 2003 Reactor Trip. I have made two changes from the draft versionthat I sent out on 3/16/03;

Corrected a typographical error on page 13 ('Note' became "Not")Changed time that PEO entered charging pump cubicle from 14:44 to 14:47based on recent information from security gate logs

Please call me if you have any comments on this product

Borch (s |

(See attached file: Mar_2003Timeline.doc)

Millstone 2 - March 2003 Reactor TripSequence of Events Timeline - Rev. 0

Time Description of Event CommentMarch 7, 2003

13:21 Reactor operating at 100% power. Pressurizer pressure - 2250 psiaCVCS operating within normally expected values: Pressurizer level 65%* "C" charging pump operating* Charging flow rate approximately 45 gpm* Letdown flow rate approximately 40 gpm* RCP bleedoff flow rate to VCT approximately 4 gpm* VCT level steady at approximately 85%

13:21 Released SP 2401D, "RPS Matrix Testing," for performance High Risk Surveillance14:07:54 I&C began RPS Matrix Testing - Trip Circuit Breakers (TCB) 1 and 5

were opened as part of test14:39:22 TCB-2 and TCB-6 were opened (as expected) while testing "A-C" matrix. Reactor Trip

TCB-1 and TCB-5 opened due to a switch malfunction. CR-03-0230014:39:22 to 14:39:23 * Main turbine/generator trip Normal trip response

* 6.9 KV and 4.16 KV breakers to NSST opened* 6.9 KV and 4.16 KV breakers to RSST closed* Main turbine stop valves and intercept valves closed* Generator exciter and field breakers opened

14:39:25 All 61 control rods indicate fully inserted14:39:26 to 14:39:27 The following main steam safety valves indicated weeping: Not unusual to see 1 or 2 safety

* 2-MS-252 valves weep from a 100% power* 2-MS-242 trip - 6 is more than expected* 2-MS-246* 2-MS-247 Valves are listed in order that* 2-MS-245 alarms were received* 2-MS-254

14:39:27 Pressurizer level Hi/Lo annunciator alarm received for both Channels "X" Alarm setpoints are:and "Y" * 1% l above program level

* 5% below program level

Page I of 14March 17, 2003

, 4


Time Description of Event Comment14:39:27 "A" and "B" charging pumps start Pressurizer level was 65.6%

* "B" charging pump started at 14:39:27.5038 Pressurizer pressure was 2244 psia* "A" charging pump started at 14:39:27.6129

14:39:28 Atmospheric steam dump valves opened SG pressures were greater than thenormal opening setpoint of 920psia - No "Quick Open" signal -

._ CR-03-02395

14:39:28 to 14:39:32 The following main steam safety valves opened: * Highest observed SG 1* 2-MS-242 pressure was 1008 psia* 2-MS-246 * Highest observed SG 2* 2-MS-254 pressure was 1017 psia* 2-MS-252 * Valves are listed in order that* 2-MS-247 they opened* 2-MS-245 * CR-03-02310

14:39:34 to 14:46 Charging header pressure (P212) indicated fluctuating pressure between All 3 charging pumps were2000 and 2500 psig. Charging flow (F212) indicated fluctuations operatingbetween 32 to 48 gpm with a general decreasing trend that settled out atabout 38 gpm with a discharge header pressure of about 2667 psig atabout 2 minutes following the start of the "A" and "B" charging pumps

14:39:43 to 14:40:38 Several charging pump low lube oil pressure alarms were received and System Engineer says this iscleared for the "A" and "B" charging pumps normal following start of an idle

pump14:39:49 "A" condenser steam dump valve opened Valve appears to have modulated

open on its normal openingsetpoint of 880 psia - No "QuickOpen" signal

14:40 Entered EOP 2525, "Standard Post Trip Actions"14:40:10 to 14:40:42 The 6 main steam safety valves closed SG pressures were about 920 psia

14:40:29 Auxiliary Feedwater Auto Start signals generated - SG blowdown Setpoint is SG level < 26.8%isolated - timer started for auto AFW pump start II

Page 2 of 14March 17, 2003


Time Description of Event Comment14:41:32 Atmospheric steam dump valves closed14:41:49 "B," "C" and "D" condenser dump valves opened Valves appears to have modulated

open on their normal openingsetpoint of 5350F - No "QuickOpen" signal - CR-03-02305 andCR-03-02426

14:41:50 Radiation monitor RM-8997 (Radwaste Exhaust Particulate) indication Was reading about 380 to 410 cpmbegins to increase (reading about 450 cpm and increasing) prior to trip

14:41:51 "B," "C" and "D" condenser dump valves closed14:41:46 to 14:43:55 The 6 main steam safety valves stopped "weeping"

14:42:27 "B" SGFP steam stop valves closed. "A" SGFP remained operating14:43:25 to 14:43:37 Heater drains punmps and 2 condensate pumps stopped Normal post-trip actions14:43:57 to 14:43:58 "A" and "B" Auxiliary Feedwater pumps automatically started

14:44 Radiation monitor RM-8123A (Unit 2 Stack Particulate) indication begins Was reading about 100 to 110 cpmto increase (reading about 125 cpm and increasing) prior to trip

14:46:25 Pressurizer Level Channel "Y" Lo-Lo level alarm received - all Setpoint is • 20%pressurizer heaters de-energized

14:47 to 14:48 * Main feedwater block valves closed (2-FW-42A and 2-FW-42B) Normal post-trip actions. Main* SGFP "B" discharge isolation valve closed (2-FW-38B) FW supplied to SGs via bypass

valves from "A" SGFP14:47 Aux. Building PEO entered charging pump cubicle and noticed that water Security gate log shows PEO

was gushing out of the discharge relief valve tell-tale holes at about 15 entering through door 239E atgpm each for the "B" and "C" charging pumps, and at about 2 gpm for the 14:45:48 - reasonable time to"A" charging pump. The PEO also noted that 3 valve hand wheels were reach charging pump arealying on the floor. CR-03-02333

14:48 Entered TSAS 3.4.4.b, Action b (No pressurizer heaters are operable) Pressurizer level < 20%14:48:25 to 14:49:58 Numerous (14) charging low flow alarms are received Setpoint is < 25 gpm14:49:00 to 14:50:26 Charging header pressure fluctuates between 2225 psig and 3089 psig.

When pressure spikes to 3089 psig, flow decreases to zero. Whenpressure goes to 2250 psig, flow goes to about 28 gpm.



Time Description of Event Comment14:49 Entered TSAS 3.0.3 - No charging pumps are operable - can not meet No indicated charging flow

requirements of LCO 3.1.2.2, 3.1.2.4 and 3.5.2.d14:50 Unit Supervisor (US) directed Plant Equipment Operator (PEO) to close

discharge valves for "B" and "C" charging pumps14:50:20 "C" charging pump is stopped SOE log shows pump

* stopped at 14:50:20.832* started at 14:50:20.8328* stopped at 14:50:21.2311

14:50:28 Charging header pressure stops spiking - charging header pressure is "A" and "B" charging pumps areabout 2055 psig operating

14:50:28 to 14:50:34 Charging header flow increases from 0 to 18 gpm14:50:32 to 14:53:00 VCT level decrease stops and starts increasing Level decreased from 85.1 % to

81.2% from time of trip to timewhen "C" charging pump stopped

14:50:34 "B" charging pump is stopped Charging flow goes to zero14:52:35 to 14:52:39 Letdown isolation valves closed (2-CH-515 and 2-CH-516)

15:00 * Radiation monitor RM-8997 (Radwaste Exhaust Particulate) The highest value recorded by theindication has increased greater than 8000 cpm and continues to PPC for RM-8123A was 249 cpmincrease. at 14:59:54.

* Radiation monitor RM-8123A (Unit 2 Stack Particulate) indicationhas increased to about 225 cpm_

15:00:07 Pressurizer Level Channel "Y" Lo-Lo level alarm cleared - backup Caused by RCS heatup - ADVpressurizer heaters energize opened in response to heatup

15:03 "B" and "C" charging pumps isolated. "C" discharge relief valve isseated. "B" discharge relief valve is leaking at 10 gpm onto the floor

15:03:41 to 15:03:44 Operators closed breakers for pressurizer proportional heaters Pressurizer pressure = 2075 psia15:06:44 "A" charging pump is stopped Pressurizer pressure = 2148 psia

Pressurizer level - 23%15:07:57 Pressurizer Level Channel "Y" Lo-Lo level alarm received - all Setpoint is < 20%

pressurizer heaters de-energized


. b


Time Description of Event Comment15:09 Re-verified "B" and "C" charging pump discharge valves are closed. "B" CR-03-02301, CR-03-0231 1,

discharge relief valve leaking at 0 gpm. "A" charging pump discharge CR-03-02313, CR-03-02337relief valve leaking at 2 gpm.

15:16 Shift Manager declared an "Unusual Event - Delta 1" due to RCS leakage15:16 Entered TSAS 3.4.6.2, Action b (RCS leakage) Unidentified leak rate > I gpm15:21 * Radiation monitor RM-8997 (Radwaste Exhaust Particulate) The highest value recorded by the

indication has increased to approximately 12000 cpm and begins to PPC for RM-8997 was 12589 cpmdecrease at 15:21:18.

a Radiation monitor RM-8123A (Unit 2 Stack Particulate) indicationhas decreased to about 195 cpm and continues to decrease.

15:23 "Unusual Event - Delta 1" message was released IRF 200301215:24 PEO verified suction and discharge valves open on "A" charging pump Dual verification

with SRO15:27:21 Started "A" charging pump. No indication of charging flow, no decrease Pressurizer pressure - 2020 psia

in VCT level Pressurizer level = 18%15:45 An update to the "Unusual Event - Delta 1" message was released15:46 Station Duty Officer notified NRC of "Unusual Event - Delta I"15:51 Aux. Building PEO noted that the "A" charging pump was hot. He could No indicated charging flow.

feel the heat radiating from the running pump. The suction stabilizer wastoo hot to hold a hand against. There was steam coming from the tell-talehole on the discharge relief valve.

15:51:53 Stopped "A" charging pump Pressurizer pressure = 1950 psiaPressurizer level 17.7%

15:52 Entered EOP 2532, "Loss of Coolant"15:55 Decision made to align charging to "alternate charging flow path" via the No log entries - time is speculated

HPSI system. based on observed changes in SIheader pressure that occurred atabout 1600.

15:59 Placed Auto Aux. Feedwater Over-ride handswitch in pull-to-lock and AFW not needed. "A" SGFPI secured "A" and "B" AFW pumps maintaining SG levels



Time Description of Event Comment16:00:30 to 16:01:00 Charging header pressure decreased from 1960 psig to about 370 psig, Caused by opening cross-tie

and SI header pressures increased from about 225 psig to about 360 psig. valves to HPSI header16:04 Containment radiation monitor sample fans (F39A and F39B) were These were stopped to align H2

stopped. monitors for operation16:05 Closed charging header isolation valve (2-CH-429)16:07 "A" charging pump discharge isolation valve closed (2-CH-339) From "rough log"

16:05 to 16:20 Aux. Building PEO vents suction stabilizer for "A" charging pump. The Times are approximate and arepump discharge spool was also drained to the CVCS drains collection based on observed L9796 leveltank (which showed a level increase of 9%). change at 16: 10.

16:20 Entered TSAS 3.5.2, Action a (Facility I HPSI is inoperable due toaligning to the alternate charging path)

16:24 Verified "A" charging pump discharge isolation valve open From "rough" log16:24:37 Started "A" charging pump. No indication of charging flow through SI Pressurizer pressure - 1862 psia

header, no decrease in VCT level, no increase in pressurizer level. Pressurizer level = 17.2%Charging header pressure and SI header pressure increased toapproximately 1875 psig and 1860 psig, respectively.

16:27:05 Stopped "A" charging pump. ___16:28:26 Opened RWST to charging suction isolation valve (2-CH-192)16:28:45 Closed VCT outlet isolation valve (2-CH-501)16:31:33 Started "A" charging pump. No indication of charging flow through SI Pressurizer pressure = 1844 psia

header, no increase in pressurizer level. Pressurizer level = 17%16:32:43 Stopped "A" charging pump. PEO noted that the pum oa 1Biitl,

16:35 Health Physics is taking containment air samples in case a containmententry is required.

16:35 Not meeting RCS Inventory Safety Function for EOP 2532. Decisionmade to not transition to another EOP since best efforts were being madeto recover inventory.



Time Description of Event Comment16:35 Decision made to restart the "C" charging pump with the discharge relief CR-03-02507

valve gagged (to stop the leak). A hose was fitted from the relief valvetell-tale hole to direct the leakoff to the floor drain (since the bellows onthe relief valve was ruptured, the water was coming from the pumpsuction).

16:35 to 16:39 "C" charging pump discharge isolation valve opened16:37 to 16:43 Pressurizer Pressure Low - SIAS Block Permit alarms received Setpoint is c 1850 psia

16:38 An update to the "Unusual Event - Delta 1" message was released IRF 200301316:42:47 "C" charging pump started. Charging header pressure and SI header Pressurizer pressure = 1818 psia

pressure increased to approximately 1910 psig and 1840 psig, Pressurizer level = 17.1%respectively. Indicated flow through loop 2A SI header increased from-37 gpm to approximately 15 gpm.

16:43 Pressurizer level observed to be increasing16:54 Exited TSAS 3.4.4, Action b. Pressurizer level > 20% - pressurizer

heaters are operable16:55:43 Pressurizer Level Channel "Y" Lo-Lo level alarm cleared - backup Pressurizer level > 20%

pressurizer heaters energized.17:29 Radiation monitor RM-8997 (Radwaste Exhaust Particulate) indication

has decreased to < 3000 cpm17:30 Pressurizer pressure = 1992 psia and pressurizer level = 45% RWST level is observed to be

decreasing - expected response17:37 Stopped RWST recirculating pumps due to RWST level < 95%18:00 Pressurizer pressure 1992 psia and pressurizer level = 65%

18:02:33 Stopped "C" charging pump Pressurizer level is restored, noletdown available

18:05 Containment sump pumped. Consideration given to RCS leak outsidecontainment. Sump level increase verified to be at a normal rate. I



Time Description of Event Comment18:50:47 Started "B" charging pump - injecting via alternate charging flow path No log entries nor other

information available concerningopening of discharge isolationvalve

18:53:35 Stopped "B" charging pump. Pressurizer level changed from 67% to_ 68.5% (as indicated by PPC level indication LI 10Y)

19:36 Stopped "A" and "C" reactor coolant pumps EOP 2541, Appendix 8, step 219:45 Commenced plant cooldown per EOP 253219:56 Blocked SIAS per EOP 253220:00 Entered Mode 3* (Tav, > 300'F, pressurizer pressure < 1750 psia)20:01 Exited TSAS 3.5.2, Action a for Facility 1 HPSI pump No longer required for Mode 3*20:04 Started "B" boric acid pump - aligned to charging pump suction.

20:04:15 Started "B" charging pump - borating RCS via alternate charging flowpath

20:07 Placed "A" HPSI pump in pull-to-lock EOP 2541, Appendix 8, step 920:10:43 Loose Parts Monitor Alarm re-set (received following reactor trip) CR-03-02316

20:32 Blocked Main Steam Isolation (MSI) actuation signal SG pressure < 700 psia20:50 An update to the "Unusual Event - Delta 1" message was released for LCO 3.0.3 was entered at 14:49,

exceeding the time allowed per LCO 3.0.3 to place the unit in Hot TS require that the unit be in ModeShutdown (Mode 4) - RCS temperature was - 4901F 4 within 6 hours - CR-03-02315

21:20 Installed jumpers to remove SIAS open capability from LPSI injection EOP 2541, Appendix 8, step 5valves

21:55 Stopped "B" boric acid pump - aligned charging pump suction to RWST RCS temperature = 4330 F21:57 US notified that the opening and closing coils for shutdown cooling EOP 2541, Appendix 8, step 6

suction and isolation valve (2-SI-651) are installed22:18 Entered TRM 7.1, Table 7.1.7, Action a - valve 2-SI-651 is being made SM Log should say "Action b"

operable in preparation for SDC initiation (Appendix R)22:29 Containment sump level begins increasing at a higher rate Containment radiation monitor

fans (F-39A and F-39B) are still_"Off'



Time Description of Event Comment22:54 Exit conditions for EOP 2532 are met - transitioned from EOP 2532 to

OP 2207, Plant Cooldown23:00 Stopped "D" reactor coolant pump and started "A" reactor coolant pump Auxiliary spray from charging is

to allow concurrent RCP and SDC operations not available23:13:59 "A" SGFP stopped - condenser backpressure 7 inches Hg and Steam pressure was too low to

increasing keep steam jet air ejectors running23:21:57 "A" SGFP discharge isolation valve closed (2-FW-38A) Feeding steam generators using

"A" condensate pump23:26 Started "A" auxiliary feedwater pump

23:46:31 Received alarm for "Condenser Steam Dump/Bypass Vacuum" block It appears that the operators brokecondenser vacuum

23:58:15 Loose Parts Monitor alarm received No explanation for this alarm_ given

________________ ~~~March 8,2003_ _ _ _ _ _ _ _ _ _ _ _ _

00:11:27 SG #1 Main Steam Isolation Valve (MSIV) closed00:13:27 PPC alarm received for high containment sump leak rate > 1 gpm Containment radiation monitor

fans (F-39A and F-39B) are still"Off' - radiation monitors notavailable

00:30:35 PPC alarm received for high containment sump leak rate = 1.657 gpm00:37:51 SG #2 MSIV closed00:50:27 Stopped "B" charging pump - RCS temperature = 2950F Pressurizer pressure - 400 psia

Pressurizer level = 65%01:08 Entered Mode 4 (Hot Shutdown) - Holding pressurizer pressure - 400

psia and RCS temperature = 2950F for I&C LTOP surveillance01:18 Chemistry reports RCS boron concentration = 1142 ppm at 00:30 Shutdown Margin requirements

satisfied01:39 Placed "C" HPSI pump in pull-to-lock OP 2207, step 4.12.6

01:44:15 PPC alarm cleared for high containment sump leak rate = 0.797 Pm01:46 Terminated "Unusual Event"



Time Description of Event Comment01:53 to 07:10 Numerous "C" reactor coolant pump seal controlled bleedoff high flow

alarms received02:01 Pumped containment sump from 81% to 10%

02:12:59 PPC alarm received for high containment sump leak rate = 1.006 gpm02:16 to 04:07 Numerous Facility 1 and Facility 2 ICCMS trouble alarms received

02:20 "A" condensate pump stopped - feeding steam generators using "A"AFW pump

02:43 Containment radiation monitor sample fans (F39A and F39B) werestarted

02:45 to 02:52 PPC alarms received for containment particulate and containment gaseous CR-03-02414radiation monitors rising _

03:53:03 to 04:07:57 Containment radiation monitor sample fan F-39A stopped and started 3 Fan stopped to change filter papertimes

04:15:23 to 04:27:21 Containment radiation monitor sample fan F-39B stopped and started 3 Fan stopped to change filter papertimes - HP started a containment remote

air sample from RM-8262 at 04:4004:16:40 Started "A" LPSI pump for initial SDC preparations SDC boron mixing

04:20 NRC phone check - NRC requested confirmation that "Unusual Event" Routine daily phone checkhad been terminated

04:50 Pumped containment sump from 78% to 10%05:01:53 Stopped "A" LPSI pump

05:05 Chemistry reports SDC boron concentration = 2077 ppm at 04:3205:09 Closed all Safety Injection Tank outlet isolation valves OP 2207, step 4.9.405:46 Started "A" ESF room ventilation fan05:50 Established Low Temperature/Over Pressure (LTOP) protection OP 2207, step 4.13



Time Description of Event Comment05:53 to 06:05 Containment radiation monitor readings reached their highest values

during this time:* RM-8123A (Zl containment particulate) -. 1E+6 cpm* RM-8123B (ZI containment gaseous) - 16,000 cpm* RM-8262A (Z2 containment particulate) - 582,000 cpm* RM-8262B (Z2 containment gaseous) = 16,000 cpm

06:00 Plant conditions at time of shift turnover to dayshift on 3/8/2003:* RCS temperature = 2780F* Pressurizer pressure - 352 psia• Pressurizer level - 50%* "A" and "B" reactor coolant pumps operating* In procedure OP 2207, "Plant Cooldown"* Active TSAS: 3.0.3 (CVCS) and 3.3.3.8 (AVMS)

07:30 Unit 2 stack gas radiation monitor (RM-8132B) increased from = 48 cpmto over 100 cpm due to flushing of the RCS hot leg sample lines

08:24 Pumped containment sump from 85% to 10%08:46 Chemistry reports RCS boron concentration = 1174 ppm at 08:04

08:46:15 Started "B" charging pump - suction from RWST Pressurizer pressure 351 psiaPressurizer level = 44%

08:52 to 08:53 Stopped "B" and "C" circulating water pumps and cross-tied condenserwaterboxes

09:45 Both letdown backpressure control valves (2-CH-201P & Q) are reportedun-isolated in preparation for placing letdown in service

09:55:31 Stopped "B" charging pump Pressurizer pressure = 341 psiaPressurizer level = 76%

10:22 Valve 2-SI-709 (Shutdown Cooling isolation) is open in preparation forshutdown cooling

10:41 RCS pressure is less than 280 psia with RCPs in operation - starting 8 8 hours clock is to prevent RCPhour clock seal degradation - CR-03-02314

11:00:49 Manual disconnect switch for valve 2-SI-652 closed Shutdown cooling preparation


. I .


Time Description of Event Comment11:05 to 11:07 Shutdown cooling isolation valves (2-SI-651 and 2-SI-652) opened

11:07 Pumped containment sump from 79% to 8%11:22:05 Started "A" LPSI pump Shutdown cooling initiation

11:49 Auxiliary building -45 foot elevation (Aerated waste tank room) is postedas a high radiation area

11:50 Removing decay heat via shutdown cooling Pressurizer pressure = 256 psiaPressurizer level = 73%

12:03 Auxiliary building -45 foot elevation ("A" and "B" ESF rooms) areposted as a high radiation areas due to shutdown cooling operation

12:45 Commenced troubleshooting Reactor Protection System "A-C" matrix13:15 Started "B" boric acid pump for recirculation of "B" boric acid storage

tank14:31 Pumped containment sump from 78% to 10% No SM Log entry14:42 Entering containment for air sampling prior to inspection14:51 Health Physics bypassed local alarm for charging pump area radiation

monitor (RM-7894)14:55 Held briefing for radiography in charging pump area15:27 Pressurizer spray AT (main spray) exceed 200F - Engineering notified15:36 Entered Mode 5 - Exited TSAS 3.0.3, Entered TSAS 3.1.2.3 (no Tave < 200TF

operable charging pumps)15:37 Exited the following TSAS: No longer applicable in Mode 5

. 3.1.2.4 (2 charging pumps operable)* 3.5.3.a (Operate HPSI and lower mode ECCS)Exited the following TRM:* 7.1.7, Table 7.1.7-1, item b (Appendix R for 2-SI-651)* 7.1.17, Table 7.1.17-1, items b and c (Appendix R for 2-MS-65A&B)

15:48 Opened "A" charging pump circuit breaker per OP 2207, "PlantCooldown"


t.


Time Description of Event Comment16:01 Upon re-entry to containment found a leak from the "C" RCP vapor seal Leak later reported to be

approximately 1 to 2 gpmCR-03-02312

16:24:23 Started "B" charging pump raise pressurizer level and to add lithium for Pressurizer pressure - 252 psiaRCS pH control Pressurizer level = 46%

16:48:49 Stopped "B" charging pump Pressurizer level = 56%16:50 Started radiography in the charging pump area Radiation monitor alarms received

____ due to radiography17:05 Exited TSAS 3.3.3.8 (AVMS) Not required in Mode 517:47 Pumped containment sump from 78% to 10%20:19 Filled both steam generators to 85% indicated level - stopped "A" AFW

pump20:22 Assessed impact of stopping RCPs on shutdown safety assessment - OP 2264, step 4.3.5

determined that both S/Gs will remain available for RCS decay heatremoval via natural circulation

20:22 Stopped "A" and "B" reactor coolant pumps20:30 Entered TSAS 3.4.9.1 (RCS cooldown exceeded 30'F/hour limit) - CR-03-02320

cooldown rate was noted to <31 TF/hour and less than the transient limit of50_F/hour - cooldown rate was immediately restored to < 30 'F/hour

21:07 Pumped containment sump from.78% to 10%21:39 Notified that radiography is completed in charging pump area21:52 Plant cooldown is terminated - RCS Tavc = 1780F


11 .


Data Sources:1. Millstone 2 Shift Manager's Log e-SOMS entries from 03/07/2003 at 00:00 to 03/09/2003 at 05:582. Health Physics Log e-SOMS entries from 03/07/2003 at 00:00 to 03/09/2003 at 00:003. Sequence of Events Log computer printout (SOLDATA.DAT;3097) - post trip SOE log from 03/06/2003 at 08:29:02 to

03/07/2003 at 14:44:194. Sequence of Events Log computer printout (SOLDATA.DAT;3103) - SOE log from 03/07/2003 at 14:30:35 to 03/07/2003 at

15:30:355. PPC Alarm Messages computer printout (QUEPRT.LIS;58) from 03/07/2003 at 13:01:07 to 03/07/2003 at'21:01:036. PPC Alarm Messages computer printout (QUEPRT.LIS;65) from 03/07/2003 at 21:01:03 to 03/09/2003 at 00:11 :077. Operations "rough logs" from 3/7/20038. Plant Process Computer analog and digital data - stored at a 2 second resolution9. Draft timeline of events generated by Event Review Team on 3/11/200310. Draft event timeline for charging system generated by Engineering on 3/14/200311. Security gate log 03/07/2003 from 14:00:00 to 23:00:59 (Stilphen, Jordan, Ewers and Saulter)


7;,

from: botrnfai4 · millstone 2 - march 2003 reactor trip sequence of events timeline -rev. 0 time...

Documents